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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-308) Improve documentation about what "asks" means in AMRMProtocol
Date Fri, 04 Jan 2013 17:50:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13544064#comment-13544064
] 

Bikas Saha commented on YARN-308:
---------------------------------

You would want to look at YARN-103 and related jiras that are trying to make the protocol
easy to use by implementing base libraries that hide the protocol complexity.
The AMRM protocol is not a delta protocol but an absolute one. So every ask request sends
all outstanding requests to the RM.
                
> Improve documentation about what "asks" means in AMRMProtocol
> -------------------------------------------------------------
>
>                 Key: YARN-308
>                 URL: https://issues.apache.org/jira/browse/YARN-308
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: api, resourcemanager
>    Affects Versions: 2.0.2-alpha
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>             Fix For: 2.0.3-alpha
>
>
> It's unclear to me from reading the javadoc exactly what "asks" means when the AM sends
a heartbeat to the RM.  Is the AM supposed to send a list of all resources that it is waiting
for?  Or just inform the RM about new ones that it wants?

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